HITUNGLAH KELILING DAN LUAS DI BAWAH INI
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K=40+40+20+1/2Πd
=40+40+20+1/2*3,14*20
=40+40+20+31,4
= 131,4 cm
L= L.pers + L.1/2ling
= p*l + 1/2Πr*r
=40*20+1/2*3.14*5*5
=40*20+1,57*25
=800+39,25
=839,25 cm(kuadrat)